Neutron Diffraction Study of the p - T Phase Diagram for Erbium |
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| Authors: | M. Ellerby K. A. Mcewen J. Jensen M. J. Bull |
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| Affiliation: | 1. Department of Physics and Astronomy , University College London , Gower Street, London , WC1E 6BT , UK Fax: E-mail: mark.ellerby@ucl.ac.uk;2. Department of Physics and Astronomy , University College London , Gower Street, London , WC1E 6BT , UK;3. ?rsted Laboratory , Niels Bohr Institute fAPG , Universitetsparken 5, Copenhagen , 2100 , Denmark;4. ISIS Facility , CLRC Rutherford Appleton Laboratory , Chilton, Didcot , OX11 OQX , UK |
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| Abstract: | Electrical resistivity measurements performed on a single crystal of erbium as a function of temperature and hydrostatic pressure have provided a preliminary p - T phase diagram. The results have been interpreted in terms of a model for the magnetic structures of Er deduced from neutron diffraction studies at ambient pressure. This model predicted the existence of a magnetic structure with a wave vector of Q =2/7 c * at 4.2 K, when the applied pressure is larger than 3 kbar. This paper reports a neutron diffraction study of erbium made in the temperature range of 4 to 100 K, at pressures between 0.5 and 6 kbar. We have observed the predicted suppression of the low temperature conical ferromagnetic phase and the emergence of a new phase with Q =8/33 c *. The neutron diffraction measurements has enabled us to identify the various phases that develop from the cycloidal phases previously observed at atmospheric pressure. |
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| Keywords: | Rare-earth Pressure Neutron Diffraction Magnetic Structures Phase-diagram |
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